Fix yaml parse issue

[gowthamrajj]

Changes

• YAML reserved tokens round-trip safely. Values like OFF, ON, YES, NO (and lowercase variants) are now quoted on emit and tolerated on load, so time_intervals: OFF no longer turns into false in the manifest and crashes sync. Per-column meta failures also name the offending column.
• Sync errors surface the real cause. SQL/YML generation failures now show the underlying message instead of always pointing at expr syntax.

[arunxdev]

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